Watts to kWh Calculator
Calculate energy consumption from power over time.
Free · instant · private
Watts
Hours
kWh
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Formula & explanation
Formula
kWh = W × h ÷ 1000
Explained
Energy in kilowatt-hours equals power in watts times hours divided by 1000. Converts instantaneous power to cumulative energy.
Used For
Daily solar production estimation, appliance energy cost calculation